linux-kernel - Re: [PATCH 1/2] powerpc: Make the code in __show

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Date:   Sat, 24 Apr 2021 22:36:53 +0800
From:   Xiongwei Song <sxwjean@...il.com>
To:     Christophe Leroy <christophe.leroy@...roup.eu>
Cc:     Xiongwei Song <sxwjean@...com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>, npiggin@...il.com,
        ravi.bangoria@...ux.ibm.com, mikey@...ling.org,
        aneesh.kumar@...ux.ibm.com, 0x7f454c46@...il.com,
        PowerPC <linuxppc-dev@...ts.ozlabs.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] powerpc: Make the code in __show_regs nice-looking

On Thu, Apr 22, 2021 at 11:27 PM Christophe Leroy
<christophe.leroy@...roup.eu> wrote:
>
>
>
> Le 22/04/2021 à 17:10, Xiongwei Song a écrit :
> > From: Xiongwei Song <sxwjean@...il.com>
> >
> > Create a new function named interrupt_detail_printable to judge which
> > interrupts can print esr/dsisr register.
>
> What is the benefit of that function ? It may be interesting if the test was done at several places,
> but as it is done at only one place, I don't thing it is an improvement.
>
> Until know, you new immediately what was the traps that would print it. Now you have to go and look
> into a sub-function.

How about replace if statement with switch statement directly, like
the changes below:

@@ -1467,13 +1481,17 @@ static void __show_regs(struct pt_regs *regs)
        trap = TRAP(regs);
        if (!trap_is_syscall(regs) && cpu_has_feature(CPU_FTR_CFAR))
                pr_cont("CFAR: "REG" ", regs->orig_gpr3);
-       if (trap == INTERRUPT_MACHINE_CHECK ||
-           trap == INTERRUPT_DATA_STORAGE ||
-           trap == INTERRUPT_ALIGNMENT) {
+       switch(trap){
+       case INTERRUPT_MACHINE_CHECK:
+       case INTERRUPT_DATA_STORAGE:
+       case INTERRUPT_ALIGNMENT:
                if (IS_ENABLED(CONFIG_4xx) || IS_ENABLED(CONFIG_BOOKE))
                        pr_cont("DEAR: "REG" ESR: "REG" ", regs->dar,
regs->dsisr);
                else
                        pr_cont("DAR: "REG" DSISR: %08lx ", regs->dar,
regs->dsisr);
+               break;
+       default:
+               break;
        }

Thanks,
Xiongwei